I personally have not changed anything in BOINC options. Just changed 0,5 to 0,33 in app_info.xml.
Do not be afraid of 98% usage. WU completing will take a bit more time.

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To animal007uk just go for it. I experienced a slight lag in some programs (GPU heavy ones) but that's all. It had 94-95 % (one GPU unit at the time) before and 96-97 % now (3).

I noticed that KieX pick up in speed again and took away my blue berry pie so I changed my second 7770 to three GPUs. Let's see if it works this time.

Edit: I had to reduce CPU to 60 % (i7-970/12 to 7 "cores") to get a balance in GPU /CPU units. Went fro 250/280 W to a fairly constant 240 W for +10k PPD (maybe). I did the same in my i920 (8 to 6) to get that to work as well. No readings there but CPU temps went down.

So this is a little bit of a tangent.. but wanted to give a big thanks to everyone contributing to this challenge. TPU is reaching new heights with your help I hope you catch the bug and stick with us a little longer after too.

For anyone who would like to know more about what all this (fun) scientific contribution is for there is a video here from the scientists explaining what they do with your hard work:

The second link I listed above talks about adding a custom app_info.xml file that will allow you to fun multiple work units per GPU. You can probably start out with three each and move to four or more as you feel comfortable.

The HCC for gpu only or the one with HCC for gpu and gfam for cpu. I'm guessing it's the gfam one?

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Just run the one with the HCC GPU only. The CPU will do a fraction of what the GPUs do (like 5%), and this will let the CPU run cooler. And if you're going to be running 4 WUs/card that will be a sufficient load for the CPU anyways